[PATCH v2 net 2/3] lan78xx: Allow EEPROM write for less than MAX_EEPROM_SIZE

[Nisar.Sayed]

From: Nisar Sayed <nisar.sa...@microchip.com>

Allow EEPROM write for less than MAX_EEPROM_SIZE

Fixes: 55d7de9de6c3 ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 
Ethernet device driver")
Signed-off-by: Nisar Sayed <nisar.sa...@microchip.com>
---
 drivers/net/usb/lan78xx.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index baf91c7..02d64f75 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -1290,8 +1290,8 @@ static int lan78xx_ethtool_set_eeprom(struct net_device 
*netdev,
 
        /* Allow entire eeprom update only */
        if ((ee->magic == LAN78XX_EEPROM_MAGIC) &&
-           (ee->offset == 0) &&
-           (ee->len == 512) &&
+           (ee->offset >= 0 && ee->offset < MAX_EEPROM_SIZE) &&
+           (ee->len > 0 && (ee->offset + ee->len) <= MAX_EEPROM_SIZE) &&
            (data[0] == EEPROM_INDICATOR))
                ret = lan78xx_write_raw_eeprom(dev, ee->offset, ee->len, data);
        else if ((ee->magic == LAN78XX_OTP_MAGIC) &&
-- 
1.9.1